Battery card and electrical apparatus using same battery card assembly

Abstract

A battery power supply system consisting of battery card, battery card assembly where battery card slots in, and charger where battery card gets recharged is disclosed. The standardized battery card is designed in light, thin, safe, and user-friendly card configuration to make interchangeability between appliances easy and possible. The battery card assembly is designed either for single or multiple battery cards. In the case of using single battery card, the battery card assembly electrically connects to a power buffer in the electrical apparatus so the user can change their battery card without turning off the electrical apparatus within a certain time interval. In the case of multiple battery cards, the battery card assembly connects power to the electrical apparatus from only one of the battery cards. Until the first battery card is completely discharged, the battery card assembly automatically switches to another battery card without disturbing the electrical apparatus operation.

What we claim is:  
     
       1. A battery card assembly adapted to be used with an electrical apparatus, in which said electrical apparatus has a casing having a slot for mounting therein said battery card assembly, to be power-supplied by one of a plurality of battery cards contained in said battery card assembly comprising: 
       an assembly body insertable into said slot of said electrical apparatus have a plurality of card slits for respectively replaceably inserting therein said plurality of battery cards; and  
       a control circuit for selecting one of said plural battery cards to be active.  
     
     
       2. A battery card assembly according to  claim 1  wherein said battery card has a weight energy density larger than 40 watt-hours/kilograms and a volume energy density larger than 100 watt-hours/liter. 
     
     
       3. A battery card assembly according to  claim 2  wherein said battery card has said weight energy density larger than 80 watt-hours/kilograms and said volume energy density larger than 200 watt-hours/liter. 
     
     
       4. A battery card assembly according to  claim 2  wherein said battery card has a thickness smaller than 1.5 cm. 
     
     
       5. A battery card assembly according to  claim 4  wherein said battery card has a thickness smaller than 1.5 cm. 
     
     
       6. A battery card assembly adapted to be used with an electrical apparratus to be power-supplied by one of a plurality of battery cards contained in said battery card assembly comprising: 
       an assembly body electrically connected to said electrical apparatus and having a plurality of card slits for respectively replaceably inserting therein said plurality of battery cards; and  
       a control circuit for selecting one of said plurality of battery cards to be active.